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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2a59cef004e45d62376ae4545ef9b0fa9cff5b1dcc380e639c12db5d2fc306ed' 
  AND token = 'gUN/fbCs/VF6Cl6TDRuVFrJt/xrTcCV+LV5NeFVafP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}